linux-kernel - Re: [PATCH resend] uapi/linux/keyctl.h: don't use C++ reserved keyword as a struct member name

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Date:   Wed, 29 Aug 2018 15:56:48 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH resend] uapi/linux/keyctl.h: don't use C++ reserved
 keyword as a struct member name

On Tue, 28 Aug 2018 19:42:24 -0700 Greg KH <gregkh@...uxfoundation.org> wrote:

> > --- lnx-416.orig/include/uapi/linux/keyctl.h
> > +++ lnx-416/include/uapi/linux/keyctl.h
> > @@ -65,7 +65,7 @@
> >  
> >  /* keyctl structures */
> >  struct keyctl_dh_params {
> > -	__s32 private;
> > +	__s32 dh_private;
> 
> Ick ick ick, why not just put the C "namespace" on all uapi files if you
> are including them from c++ code?  I'm sure this isn't the only problem
> that has this problem, right?
> 
> This is valid C, no need to start worrying about C++ reserved names.

We've done this before and it's a simple enough change in order to be
friendly toward others.

That being said, it's been like this for two years so presumably anyone
who is using this header from C++ is already `extern "C" { ...}' around
their #include.

I'm OK with the patch as-is, but if we run into this issue more often,
we might want to look at doing something kernel-wide.

I'm not sure what though. Adding

#ifdef __cplusplus
extern "C" {
#endif

...

#ifdef __cplusplus
}
#endif

into every uapi file might work.  Unpleasing.